Study on Operation Simulation of Hydraulic Pumps Turbines by discrete-vortex-elements LES model

离散涡元LES模型水轮机运行仿真研究

基本信息

批准号：
15560132
负责人：
KAMEMOTO Kyoji
金额：
$ 2.37万
依托单位：
National University Corporation Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The purpose of this research project is to develop a turbulence model for a vortex element method and realize the virtual reality simulation of the operating state of turbo machinery.Firstly, in order to construct a new Lagrangian Large Eddy Simulation(LES) model, a vortex element redistribution model was proposed and introduced into a vortex method, which has been developed by the head investigator's group. The model was applied into a collision of two vortex rings in order to examine its validity. According to the results, complex and unsteady deformation of vorticity regions and the energy cascade mechanism were reasonably simulated using the proposed model. Furthermore, the analyzed energy spectra were in good agreement with the existing experimental data.Secondly, in order to examine the applicability of the Lagrangian LES model to the turbo machinery, simulation of three-dimensional, unsteady and complex flows through a mixed-flow pump including impeller-vanes, diffuser-vanes, and guide-vane, were carried out for three operating conditions : the design point, an off-design point and a shut-off point. The fluid forces, pressure fluctuation, and pump efficiency were calculated. The predicted characteristics of the pump reasonably agreed with the experimental ones. Through the calculation, the applicability and validity of the vortex method for analysis off low through a mixed-flow pump were confirmed.Finally, the interactive features of two-dimensional, unsteady, and complex flows through a model pump-turbine including stay-vanes, guide-vanes, and a runner were calculated and the applicability of the Lagrangian LES model was confirmed.From these results, it was revealed that the vortex method including the proposed Lagrangian LES model is a powerful tool for simulation of operation of various turbo machinery.

本研究项目的目的是建立涡元法的湍流模型，实现涡轮机械运行状态的虚拟现实模拟。提出了元素重新分布模型，并将其引入到由首席研究员团队开发的涡流方法中。该模型被应用到两个涡环的碰撞中以检验其有效性。根据结果，利用所提出的模型合理地模拟了涡区的复杂非定常变形和能量级联机制。此外，分析的能谱与现有的实验数据吻合得很好。其次，为了检验拉格朗日LES模型在涡轮机械中的适用性，对混流泵中的三维非定常复杂流动进行了仿真。包括叶轮叶片、扩压器叶片和导流叶片，针对三种工况进行了分析：设计点、非设计点和关闭点。计算了流体力、压力波动和泵效率。泵的预测特性与实验特性相当吻合。通过计算，证实了涡流法在混流泵低流分析中的适用性和有效性。最后，研究了包含固定叶片的模型水泵水轮机的二维非定常复杂流动的相互作用特征。、导流叶片和转轮进行了计算，并证实了拉格朗日 LES 模型的适用性。从这些结果表明，包括所提出的拉格朗日 LES 模型在内的涡流方法是一种强大的工具模拟各种涡轮机械的运行。